[Bug 1727158] [NEW] lscpu shows incorrect instantaneous CPU MHz value

[David Oswald]

Public bug reported:

Ubuntu 17.10:

lscpu has the following fields of interest to this report:

Model name:          Intel(R) Core(TM) i7-2700K CPU @ 3.50GHz

CPU MHz:             3499.996
CPU max MHz:         5900.0000
CPU min MHz:         1600.0000

The CPU MHz field is incorrect:  At idle it never shows down-step, and
at full load, it never shows the CPU's boost frequency (which should be
up to about 4.6GHz on my system).

This was working correctly under Ubuntu 17.04, showing the full range
between 1600 and 4600.  But with Ubuntu 17.10 it remains constantly at
the CPU's design spec of 3499.996.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: util-linux 2.30.1-0ubuntu4
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 24 22:00:02 2017
InstallationDate: Installed on 2017-09-01 (53 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: util-linux
UpgradeStatus: Upgraded to artful on 2017-10-20 (5 days ago)

** Affects: util-linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful

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https://bugs.launchpad.net/bugs/1727158

Title:
  lscpu shows incorrect instantaneous CPU MHz value

Status in util-linux package in Ubuntu:
  New

Bug description:
  Ubuntu 17.10:

  lscpu has the following fields of interest to this report:

  Model name:          Intel(R) Core(TM) i7-2700K CPU @ 3.50GHz

  CPU MHz:             3499.996
  CPU max MHz:         5900.0000
  CPU min MHz:         1600.0000

  The CPU MHz field is incorrect:  At idle it never shows down-step, and
  at full load, it never shows the CPU's boost frequency (which should
  be up to about 4.6GHz on my system).

  This was working correctly under Ubuntu 17.04, showing the full range
  between 1600 and 4600.  But with Ubuntu 17.10 it remains constantly at
  the CPU's design spec of 3499.996.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: util-linux 2.30.1-0ubuntu4
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.7-0ubuntu3
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Oct 24 22:00:02 2017
  InstallationDate: Installed on 2017-09-01 (53 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: util-linux
  UpgradeStatus: Upgraded to artful on 2017-10-20 (5 days ago)

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